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Exhibition Label : Nuffield Department of Anaesthetics display (April - August 2008)

Denis Browne ‘Top Hat’, invented 1928

Strictly speaking, this is a closed inhaler rather than an open mask.
The design meant the anaesthetist could gradually increase the
concentration of ether and then maintain a high level of the anaesthetic.
Gauze pushed down into the tube properly would have
a flat surface, ensuring even distribution of the ether through the
fabric and preventing drips.

Inv. 10338

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